Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.yarn.exceptions.YarnRuntimeException

最新推荐文章于 2025-06-17 19:05:02 发布

tutouxiaocaiji

最新推荐文章于 2025-06-17 19:05:02 发布

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文章标签： hadoop 大数据

本文链接：https://blog.youkuaiyun.com/tutouxiaocaiji/article/details/116424512

博主在学习Hadoop时遇到了运行WordCount程序报ClassNotFoundException的问题，检查发现是配置文件yarn-site.xml和mapred-site.xml的问题。经过调整yarn.application.classpath和mapreduce.application.classpath的配置，添加了Hadoop相关目录，问题得以解决。建议遇到相同问题的学习者对比配置进行排查。

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日志报错内容：Caused by:java.lang.ClassNotFoundException:org.apache.hadoop.yarn.exceptions.YarnRuntimeException at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) … 7 more

本人初学hadoop,是按照尚硅谷的b站视频学习，也是按照尚硅谷的配置文档配置的yarn-site.sml等等，但是到我运行wordcount就报错。现把我修改的地方大家可以在做个对比（仅针对我修改的文档做对比，未修改的地方就按照尚硅谷的资料来配置）。

此处为尚硅谷的配置文档

1：yarn-site.xml

		                                            <configuration>
													 <!-- 指定 MR 走 shuffle -->
													 <property>
													 <name>yarn.nodemanager.aux-services</name>
													 <value>mapreduce_shuffle</value>
													 </property>
													 <!-- 指定 ResourceManager 的地址-->
													 <property>
													 <name>yarn.resourcemanager.hostname</name>
													 <value>hadoop103</value>
													 </property>
													 <!-- 环境变量的继承 -->
													 <property>
													 <name>yarn.nodemanager.env-whitelist</name>
													 
													<value>JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CO
													NF_DIR,CLASSPATH_PREPEND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAP
													RED_HOME</value>
													 </property>
													
													<!-- 开启日志聚集功能 -->
													<property>
													 <name>yarn.log-aggregation-enable</name>
													 <value>true</value>
													</property>
													<!-- 设置日志聚集服务器地址 -->
													<property> 
													 <name>yarn.log.server.url</name> 
													 <value>http://hadoop102:19888/jobhistory/logs</value>
													</property>
													<!-- 设置日志保留时间为 7 天 -->
													<property>
													 <name>yarn.log-aggregation.retain-seconds</name>
													 <value>604800</value>
													</property>
													</configuration>

2:mapred-site.xml

											           <!-- 历史服务器端地址 -->
														<property>
														 <name>mapreduce.jobhistory.address</name>
														 <value>hadoop102:10020</value>
														</property>
														<!-- 历史服务器 web 端地址 -->
														<property>
														 <name>mapreduce.jobhistory.webapp.address</name>
														 <value>hadoop102:19888</value>
														</property>

自行修改的地方

1：yarn-site.xml

<configuration>
<!-- 指定 MR 走 shuffle -->
<property>
	<name>yarn.nodemanager.aux-services</name>
	<value>mapreduce_shuffle</value>
</property>
<!-- 指定 ResourceManager 的地址-->
<property>
	<name>yarn.resourcemanager.hostname</name>
	<value>hadoop103</value>
</property>
<!-- 环境变量的继承 -->
<property>
<name>yarn.nodemanager.env-whitelist</name>
	<value>JAVA_HOME,HADOOP_COMMON_HOME,HADOOP_HDFS_HOME,HADOOP_CONF_DIR,
	CLASSPATH_PREPEND_DISTCACHE,HADOOP_YARN_HOME,HADOOP_MAPRED_HOME</value>
</property>													
<property>
	<name>yarn.application.classpath</name>
<value>
	$HADOOP_CONF_DIR,
	$HADOOP_COMMON_HOME/share/hadoop/common/*,
	$HADOOP_COMMON_HOME/share/hadoop/common/lib/*,
	$HADOOP_HDFS_HOME/share/hadoop/hdfs/*,
	$HADOOP_HDFS_HOME/share/hadoop/hdfs/lib/*,
	$YARN_HOME/share/hadoop/yarn/*
	$YARN_HOME/share/hadoop/yarn/lib/*
	$YARN_HOME/share/hadoop/mapreduce/*,
	$YARN_HOME/share/hadoop/mapreduce/lib/*
	export HADOOP_MAPRED_HOME=$HADOOP_HOME
	export HADOOP_COMMON_HOME=$HADOOP_HOME
	export HADOOP_HDFS_HOME=$HADOOP_HOME
	export YARN_HOME=$HADOOP_HOME
	export HADOOP_YARN_HOME=$HADOOP_HOME
	export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop
	export HDFS_CONF_DIR=$HADOOP_HOME/etc/hadoop
	export YARN_CONF_DIR=$HADOOP_HOME/etc/hadoop
     </value>
</property>														
<property>
	<name>yarn.application.classpath</name>
<value>
	/opt/module/hadoop-3.1.3/etc/*,        
	/opt/module/hadoop-3.1.3/etc/hadoop/*,
	/opt/module/hadoop-3.1.3/lib/*,
	/opt/module/hadoop-3.1.3/share/hadoop/common/*,
	/opt/module/hadoop-3.1.3/share/hadoop/common/lib/*,
	/opt/module/hadoop-3.1.3/share/hadoop/mapreduce/*,
	/opt/module/hadoop-3.1.3/share/hadoop/mapreduce/lib-examples/*,
	/opt/module/hadoop-3.1.3/share/hadoop/hdfs/*,
	/opt/module/hadoop-3.1.3/share/hadoop/hdfs/lib/*,
	/opt/module/hadoop-3.1.3/share/hadoop/yarn/*,
	/opt/module/hadoop-3.1.3/share/hadoop/yarn/lib/*
     </value>
</property>															
<!-- 开启日志聚集功能 -->
<property>
	<name>yarn.log-aggregation-enable</name>
	<value>true</value>
</property>
<!-- 设置日志聚集服务器地址 -->
<property> 
	<name>yarn.log.server.url</name> 
	<value>http://hadoop102:19888/jobhistory/logs</value>
</property>
<!-- 设置日志保留时间为 7 天 -->
<property>
	<name>yarn.log-aggregation.retain-seconds</name>
	<value>604800</value>
</property>
</configuration>

2：marped-site.xml

<configuration>
<!-- 指定 MapReduce 程序运行在 Yarn 上 -->
<property>
	<name>mapreduce.framework.name</name>
	<value>yarn</value>
</property>
<property>
	<name>yarn.app.mapreduce.am.env</name>
	<value>HADOOP_MAPRED_HOME=$HADOOP_HOME</value>
</property> 
														           
<property>
<name>mapreduce.application.classpath</name>
       <value> 
	/opt/module/hadoop-3.1.3/etc/*,
	/opt/module/hadoop-3.1.3/etc/hadoop/*,
	/opt/module/hadoop-3.1.3/lib/*, 
	/opt/module/hadoop-3.1.3/share/hadoop/common/*,
	/opt/module/hadoop-3.1.3/share/hadoop/common/lib/*,
	/opt/module/hadoop-3.1.3/share/hadoop/mapreduce/*,
	/opt/module/hadoop-3.1.3/share/hadoop/mapreduce/lib-examples/*,
	/opt/module/hadoop-3.1.3/share/hadoop/hdfs/*,
	/opt/module/hadoop-3.1.3/share/hadoop/hdfs/lib/*,
	/opt/module/hadoop-3.1.3/share/hadoop/yarn/*,
	/opt/module/hadoop-3.1.3/share/hadoop/yarn/lib/*,x
       </value>
</property>
<!-- 历史服务器端地址 -->
<property>
	<name>mapreduce.jobhistory.address</name>
	<value>hadoop102:10020</value>
	</property>
<!-- 历史服务器 web 端地址 -->
<property>
	<name>mapreduce.jobhistory.webapp.address</name>
	<value>hadoop102:19888</value>
</property>
</configuration>

遇到同样问题的童鞋可以试一下，具体原因我也不懂。